Judaism cannot, according to this system, be assailed by philosophy at all, because it stands on a firm basis, which the thinker must respect, the basis of historical facts. The Jewish religion entered the world not gradually, little by little, but suddenly, like something newly created. It was revealed to a vast multitude--to millions of men--who had sufficient means of inquiring and investigating whether they were deceived by some trickery. Moreover, all the miracles that preceded the revelation on Sinai, and continued to occur during the wandering in the desert, took place in the presence of many people. Not only on one occasion, the beginning of Israel's nationality, was the evident interference of God manifested, but it revealed itself often, in the course of five hundred years, in the outpouring of the spirit of prophecy upon certain individuals and classes. By virtue of this character, of the confirmed authenticity of these facts, Judaism is invested with a certainty greater than that established by philosophy. The existence of God is demonstrated more powerfully by the revelation of Sinai than by the conclusions of the intellect. Jehuda Halevi believed that he had not only cut away the ground from beneath the philosophical views of his time, but that he had also undermined the foundations both of Christianity and Islam, and laid down the criterion by which the true could be distinguished from the false religion. Judaism does not feed its adherents with the hope of a future world full of bliss, but grants them here on earth a glimpse of the heavenly kingdom, and raises, through an enduring chain of indisputable facts, the hope of the immortality of the soul to the plane of absolute certainty.